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1277 Dolores (1933 HA)
Classification: Main-belt Asteroid          SPK-ID: 2001277
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2371810155739469 3.3043e-08  
a 2.700518061557682 8.9755e-09 au
q 2.060006445141644 8.824e-08 au
i 6.968628987449764 3.9168e-06 deg
node 247.0391370476727 3.4343e-05 deg
peri 47.08778046481303 3.544e-05 deg
M 88.52772519586166 1.0219e-05 deg
tp 2458201.892138056904
4.5217e-05 TDB
period 1620.947900581799
n .2220922707452762 1.1072e-09 deg/d
Q 3.341029677973719 1.1104e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2917  
   data-arc span      31583 days (86.47 yr)  
   first obs. used      1933-06-17  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43279  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:57:14  

Additional Information
 Earth MOID = 1.05075 au 
 Jupiter MOID = 1.88478 au 
 T_jup = 3.316 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.05   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 22
diameter diameter 32.587 km 0.802 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 12.676 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Behrend, R. (2018) Observatoire de Geneve web site,]
[Gocalves, R.M.D. (2019) Minor Planet Bull. 46, 95.]
geometric albedo albedo 0.063   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
B-V BV 0.730   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.35 deg.
U-B UB 0.378   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=11.35 deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Cb   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1277 Dolores (1933 HA)          Discovered 1933-Apr-18 by Neujmin, G. at Simeis
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1933 HA = 1925 SE = 1929 NB = 1942 JA = 1951 PB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2019-Dec-14 21:39 UT
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